Ohio Rev. Code Ann. § 2967.28
(A) As used in this section:
(B) Each sentence to a prison term for a felony of the first degree, for a felony of the second degree, for a felony sex offense, or for a felony of the third degree that is an offense of violence and is not a felony sex offense shall include a requirement that the offender be subject to a period of post-release control imposed by the parole board after the offender's release from imprisonment. This division applies with respect to all prison terms of a type described in this division, including a term of any such type that is a risk reduction sentence. If a court imposes a sentence including a prison term of a type described in this division on or after July 11, 2006, the failure of a sentencing court to notify the offender pursuant to division (B)(2)(c) of section 2929.19 of the Revised Code of this requirement or to include in the judgment of conviction entered on the journal a statement that the offender's sentence includes this requirement does not negate, limit, or otherwise affect the mandatory period of supervision that is required for the offender under this division. Section 2929.191 of the Revised Code applies if, prior to July 11, 2006, a court imposed a sentence including a prison term of a type described in this division and failed to notify the offender pursuant to division (B)(2)(c) of section 2929.19 of the Revised Code regarding post-release control or to include in the judgment of conviction entered on the journal or in the sentence pursuant to division (D)(1) of section 2929.14 of the Revised Code a statement regarding post-release control. Unless reduced by the parole board pursuant to division (D) of this section when authorized under that division, a period of post-release control required by this division for an offender shall be of one of the following periods:
(D)
(E) The department of rehabilitation and correction, in accordance with Chapter 119. of the Revised Code, shall adopt rules that do all of the following:
(5) Establish standards to be used by the adult parole authority or parole board in imposing further sanctions under division (F) of this section on releasees who violate post-release control sanctions, including standards that do the following:
(F)
(4) Any period of post-release control shall commence upon an offender's actual release from prison. If an offender is serving an indefinite prison term or a life sentence in addition to a stated prison term, the offender shall serve the period of post-release control in the following manner: